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Gibbs energy, spontaneity and relation to equilibrium constant
JEE Main level
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Difficulty 2 of 3
td099
The equilibrium constant of a reaction at
298
K
is
1.0
×
1
0
−
3
. Using
2.303
RT
=
5.71
kJ
mo
l
−
1
,
Δ
G
∘
is
A
−
5.7
kJ
mo
l
−
1
B
+
17.1
kJ
mo
l
−
1
C
−
17.1
kJ
mo
l
−
1
D
+
5.7
kJ
mo
l
−
1
Answer: B
Δ
G
∘
=
−
2.303
RT
lo
g
10
K
=
−
5.71
×
(
−
3
)
=
+
17.1
kJ
mo
l
−
1
. A small
K
corresponds to a positive
Δ
G
∘
.
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